Improvement in nuts



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Lette/rs Patent No. 83,214, dated Octolier 20, 1868.

IMPROVEMENT IN NUTS.

The Schedule referred to in these Letters Patent and making part of the same To all whom it may concern:

Be it known that l, BnNJAMiN D. SANDERS, of Wellsburg, in the county of Brooke, and State of West Virginia, have invented a new and useful Improvement in Nuts for Screw-Bolts; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, forming part oi' this specification, in which Figure l is a perspective representation of my iinproved nut.

Figure 2 is a side view of my improved nut.

In iig. l, the lower face ofthe nut is turned upwards, so as to exhibit the peculiarities of construction.

Like letters of reference denote similar parts in all the iigures.

My invention relates to the construction of nuts for screw-bolts, and is designed chiefly for nuts which are to be screwed down upon a surface of wood ,or other yielding substance, but my nuts may also be applied to metallic or non-yielding surfaces, as hereinafter described, the objectattained in` either case being a iirmer and more secure hold, and the prevention of the unscrewing 0i" the nut by vibration or jarring.

To enable others skilled in the art to make use of my improvelnent, l will proceed to 4describe the con struction and 'applimttion of my improved nut.

1 have heretofore invented an improved nut, having a concave or conical depression onits lower face, around the eye or bore, which is described in another specication.

My present invention, which is an improvement on my concave-faced nut, just refeired to, consists in making a circular collar on the lower face of the nut, of

suiiicient depth to permit the nut to enter slightly into the yielding sm'face against which it f is pressed, by screwing it down on its bolt, and in combination therewith, depressing the face of the nut from the periphery oi' such collar to or towards the 'eyeof the nut, so as A to forni an edge, either angular or rounded,.which will more readily enter the wood or other yielding surface,

and also forming one or more recesses, steps, or teeth, extending radially across the face of the nut, s'o as to take into the surface of the wood orother yielding surface, and form a secure lock or fastening, which will prevent the accidental unscrewing of the nut.

Ithe drawing, a is the nut, the exterior-of which is square, hexagonal, or other polygonal shape. b is the eye or bore of the nut, which is tapped to receive the screw-bolt. Around the eye is a cylindrical collar, c, of such diameter as may be desired, but preferably wit-h its peliphery-bounded by the plane sides of the But. The depth of this circular collar should be suiicient to allow of its entering slightly into the yielding surface against which it is screwed. The surface of the nut, within the circumference of the collar c, is dished'or concave, the concavity extending to the eye ofthe nut, so that the outer. edge of the collar shall have an angular or rounded edge, or at least be so narrow as readily to' enter the surface against which it is screwed. An edge is preferable, because, whenV terfere with the screwing down of the nut, the sharp or angular edge of the step forming a tooth, and entering the surface against which it is screwed, and thus ei'ectually preventing the' unscrewing of thenut byA accidental causes, or by means of vibration or jarring. If these nuts are used to secure together pieces of metal, awasher, of wood, lead, or other yielding'substance, may be used immediately under the nut, and if such washer be in any way secured from turning on the bolt, it will serve to lock the nut, and prevent its loosening or displacement; or a 'corresponding projec tion or step, faced in the opposite direction tothe face may be made inthe metallic of the step in the nut, i surface on which the nut is screwed, at the proper point to fasten it when-screwed down.

Having thus described my improvement in nuts,

What'I claim asmy invention, and desire to secure by Letters Patent, as an improvement on my concave# faced nut, is-

l. Ametallic nut for screw-bolts, having a body of -square or. other polygonal shape, with a cylindrical vcollar on its lower face, and a conical or concavedepression around the eye, substantially as hereinbefore described.

2. A1 metallic nut for screw-bolts, having one or more recesses or steps around the eye, with a concavity or depression on its rlower face, substantially as and for the purpose described.

In testimony whereof I, the said BENJAMIN D. SAN- DERs, have hereunto set my hand.

B. D. SANDERS;

Witnesses: v

A. S. NicnonsoN, ALLAN C. BAKEWELL, 

